-marksample- is not part of Mata. It is a Stata command.
It marks observations, not variables.
It produces a new temporary variable, not a matrix.
It is possible to use -marksample- independently of -syntax-:
. sysuse auto
(1978 Automobile Data)
. local if "2 == 2"
. marksample touse, novarlist
. su `touse'
Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
__000000 | 74 1 0 1 1
However, it is usual to use -marksample- after -syntax-, or after a set
of commands that produced similar results. I can't think up a different
kind of situation in which -marksample- is the command of choice.
Nick
[email protected]
Ashim Kapoor
I am trying to learn MATA. I have a query. What is marksample ? Does
it return a matrix with 0's in place of variables which are NOT
marked. Is it ONLY used after syntax ?
I did not find the help very useful. Can someone please shed some
light on this ?
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